Well as mentioned, I bought some IMR 4350 and Hodgdon H414. Mostly these seem to be very similar in characterstics with on being extruded and the other being a ball type powder. My cousin just gave me 3 1 lb. cans of IMR 4831, none of which are full. He buys a new can when he want to reload, the oldest can being from 1994 and it is nearly full. The second can is from 2002, probably 3/4 empty. The last can he bought, just this past week, is dated 2000, it to was about 3/4 empty (we loaded a hundred rounds out of it the other evening).
I just used up the rest of the 2000 dated can tonight. It smelled much like the 2002 (IMR 4831) and the IMR 4350 I had just bought. The 1994 can of IMR 4831 smells a tad different. Is it OK to use this stuff up? Is there anything to keep in mind when using 10+ year old powder, or should it just be disposed of?